dev: gcdb: store DSI PLL codes into emmc flash
dev: gcdb: store DSI PLL codes into emmc flash

It takes times to calibrate PLL and get codes values. So the codes
calibrated from the initial boot can be stored in emmc flash to avoid
later calibrations.

Change-Id: I892fd29f55cfd696140962d13b94b6e69cdc33b2

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